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Active Control of Multiple, Simultaneous Nonlinear Optical Processes in Plasmonic Nanogap Cavities
journal contribution
posted on 2020-03-23, 16:07 authored by Qixin Shen, Weiliang Jin, Guoce Yang, Alejandro W. Rodriguez, Maiken H. MikkelsenPlasmonic
structures are promising to enhance and control nonlinear
optical processes as the subwavelength-scale elements not only increase
the local electric field intensities, but also result in relaxed phase
matching conditions. This opens the possibility to observe and further
manipulate multiple nonlinear optical processes simultaneously, which
would be forbidden in bulk crystals due to incompatible phase matching
requirements. Here we enhance and control the relative strength between
third harmonic generation (THG), sum frequency generation (SFG), and
four wave mixing (FWM) arising from 1 to 7 nm Al2O3 layers sandwiched between a gold film and silver nanorectangles.
We demonstrate that the relative strength of the three, simultaneous
nonlinear optical processes can be precisely controlled by either
the ratio between the powers of the two excitations or the thickness
of the Al2O3 layer. Furthermore, enhancements
up to 106-fold for THG and FWM are observed along with
104-fold enhancements for SFG response when the resonance
of the transverse and longitudinal mode of the cavity are matched
to the two pump excitations. The ability to obtain and control multiple,
nonlinear optical processes simultaneously open new capabilities for
advanced on-chip manipulation and processing of optical signals on
the deep nanoscale.
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FWMfield intensitiesPlasmonic Nanogap Cavities Plasmonic structuresgenerationcontrol nonlinearTHGsilver nanorectangleson-chip manipulation7 nm Al 2 O 3 layers10 610 4strengthbulk crystalsphasegold filmActive ControlenhancementSimultaneous Nonlinear Optical ProcessesSFG responseexcitationAl 2 O 3 layersubwavelength-scale elements
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